Final answer:
Pedro Reyes must give up his position as Vice-Mayor of Quezon City when the campaign period starts, both as Vice-Mayor and similarly if he were an incumbent Congressman. The correct option is b.
Step-by-step explanation:
Pedro Reyes, the incumbent Vice-Mayor of Quezon City, who intends to run for the position of City Mayor needs to consider when he has to give up his current position.
According to Philippine election law, an elected official must vacate his or her post upon the start of the campaign period if running for a different office. Hence, the correct answer to when Pedro Reyes should give up his position as Vice-Mayor is: b. When the campaign period starts.
For the second scenario, if Pedro Reyes were an incumbent Congressman, the same rule applies. Consequently, he would also need to give up his position when the campaign period starts, as the resignation requirement doesn't change based on the specific elected position held when seeking a different elected position. The correct option is b.